Remove failure expectation of compositing/fixed-body-background-positioned.html
Remove failure expectation of compositing/fixed-body-background-positioned.html

It has been passing since we enabled slimming paint for it.

BUG=489546
TBR=wangxianzhu@chromium.org

Review URL: https://codereview.chromium.org/1212003002.

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@197837 bbb929c8-8fbe-4397-9dbb-9b2b20218538

Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk